Reservoir for a water pitcher



FIG. 1 is a right front perspective view of a reservoir for a water pitcher of the present invention;

FIG. 2 is a right side view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a front view thereof;

FIG. 6 is top view thereof; and,

FIG. 7 is a bottom view thereof. 

The ornamental design for a reservoir for a water pitcher, as shown. 